Lifeboat Foundation

Mice who ate a diet high in fat and cholesterol were more likely to see their hair turn from black to white and experience hair loss. The diet also appeared to cause inflammation of the skin.

In the first stage of the study, the researchers genetically modified mice to develop atherosclerosis, a condition in which fat deposits form in the arteries.

They then fed mice either a Western diet high in fat and cholesterol or untreated rat chow from the age of 12 to 20 weeks. As expected, the mice who consumed the Western diet saw their hair turn white and fall out, and develop skin lesions. And the longer the mice ate the diet, the worse their symptoms became. By week 36, three quarters of the animals had skin lesions.

The great powerful guppy can essentially evolve 10 million times faster than usual. Which could lead to humans evolving faster too leading to a biological singularity.

Although natural selection is often viewed as a slow pruning process, a dramatic new field study suggests it can sometimes shape a population as fast as a chain saw can rip through a sapling. Scientists have found that guppies moved to a predator-free environment adapted to it in a mere 4 years—a rate of change some 10,000 to 10 million times faster than the average rates gleaned from the fossil record. Some experts argue that the 11-year study, described in today’s issue of Science,* may even shed light on evolutionary patterns that occur over eons.

A team led by evolutionary biologist David Reznick of the University of California, Riverside, scooped guppies from a waterfall pool brimming with predators in Trinidad’s Aripo River, then released them in a tributary where only one enemy species lurked. In as little as 4 years, male guppies in the predator-free tributary were already detectably larger and older at maturity when compared with the control population; 7 years later females were too. Guppies in the safer waters also lived longer and had fewer and bigger offspring.

Continue reading “Guppy Evolution Fast Forwards” »

Many of the fundamental principles in biology and essentially all pathways regulating development were identified in so-called genetics screens. Originally pioneered in the fruit fly Drosophila and the nematode C. elegans, genetic screens involve inactivation of many genes one by one. By analyzing the consequences of gene loss, scientists can draw conclusions about its function. This way, for example, all genes required for formation of a brain can be identified.

Genetic screens can routinely be carried out in flies and worms. In humans, a wealth of knowledge exists about genetic disorders and the consequences of disease-relevant mutations, but their systematic analysis was impossible. Now, the Knoblich lab at IMBA has developed a groundbreaking technique allowing hundreds of genes to be analyzed in parallel in human tissue. They named the new technology CRISPR-LICHT and published their findings in the journal Science.

By using cerebral organoids, a 3D cell culture model for the human brain developed in Jürgen Knoblich’s group at IMBA, hundreds of mutations can now be analyzed for their role in the human brain using CRISPR-LICHT.

While our circadian body clock dictates our preferred rhythm of sleep or wakefulness, a relatively new concept—the epigenetic clock—could inform us about how swiftly we age, and how prone we are to diseases of old age.

People age at different rates, with some individuals developing both characteristics and diseases related to aging earlier in life than others. Understanding more about this so-called ‘biological age’ could help us learn more about how we can prevent diseases associated with age, such as dementia. Epigenetic markers control the extent to which genes are switched on and off across the different cell-types and tissues that make up a human body. Unlike our genetic code, these epigenetic marks change over time, and these changes can be used to accurately predict biological age from a DNA sample.

Now, scientists at the University of Exeter have developed a new epigenetic clock specifically for the human brain. As a result of using human brain tissue samples, the new clock is far more accurate than previous versions, that were based on blood samples or other tissues. The researchers hope that their new clock, published in Brain and funded by Alzheimer’s Society, will provide insight into how accelerated aging in the brain might be associated with brain diseases such as Alzheimer’s disease and other forms of dementia.

The coronavirus disease 2019 (COVID-19) pandemic does not affect everyone equally. While anyone can contract COVID-19, accumulating data suggest that older people or those with pre-existing comorbidities are far more likely to have severe complications or die from the disease. While researchers scramble to unravel the mechanisms of action underlying the disease’s wide-ranging effects, news that the disease hits older people hardest has been received without demur: it is widely accepted that to be old is to be fragile. Indeed, even in so-called normal times, everyone expects more things break as people age: bones, hearts, brains. In the context of the pandemic, being old is seen as just one more comorbidity.

It should not be.

We accept growing old and losing our vitality as an inevitability of life. To do so is to overlook the fact that ageing is, fundamentally, a plastic trait—influenced both by our genetic predispositions and many (controllable) environmental factors. Anecdotally we know this to be true: for some, being in their eighties means being confined to a wheelchair whereas for others, like Eileen Noble, who at 84 years old was the oldest runner in 2019’s London Marathon, it decidedly does not. The burgeoning field of biogerontology is now beginning to amass data in support of such observations. Single genetic mutations in evolutionarily conserved pathways across model organisms—ranging from fruit flies to mice—increase lifespan by up to 80%. Crucially, not only do these animals live longer, they also have a longer youthspan—the proportion of their lives in which they retain the trappings of youth such as peak mobility, immunity, and stress resilience.

Continue reading “The Lancet Healthy Longevity” »

Summary: A mutation in a gene associated with circadian rhythm extends the clock period, causing people to stay up late at night and sleep late in the mornings.

Source: UC Santa Cruz

A new study by researchers at UC Santa Cruz shows how a genetic mutation throws off the timing of the biological clock, causing a common sleep syndrome called delayed sleep phase disorder.

KENNEDY SPACE CENTER (FL), October 19, 2020 – The Center for the Advancement of Science in Space (CASIS) and the National Science Foundation (NSF) announced three flight projects that were selected as part of a joint solicitation focused on leveraging the International Space Station (ISS) U.S. National Laboratory to further knowledge in the fields of tissue engineering and mechanobiology. Through this collaboration, CASIS, manager of the ISS National Lab, will facilitate hardware implementation, in-orbit access, and astronaut crew time on the orbiting laboratory. NSF invested $1.2 million in the selected projects, which are seeking to advance fundamental science and engineering knowledge for the benefit of life on Earth.

This is the third collaborative research opportunity between CASIS and NSF focused on tissue engineering. Fundamental science is a major line of business for the ISS National Lab, and by conducting research in the persistent microgravity environment offered by the orbiting laboratory, NSF and the ISS National Lab will drive new advances that will bring value to our nation and spur future inquiries in low Earth orbit.

Continue reading “Three Tissue Engineering Projects Awarded From Joint National Science Foundation and CASIS Solicitation to Leverage the Space Station” »

“This is kind of a nice bookend to 16 years of research,” says Deisseroth, a neuroscientist and bioengineer at Stanford University. “It took years and years for us to sort out how to make it work.”

“The result is described this month in the journal Nature Biotechnology.”

“Optogenetics involves genetically engineering animal brains to express light-sensitive proteins—called opsins—in the membranes of neurons.”

Continue reading “No Implants Needed For Precise Control Deep Into The Brain” »

This doesn’t sound good. 🙁

Those bananas you love are Cavendish bananas, and they’re probably about to go extinct.